package org.apache.maven.model.building;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Wraps an ordinary {@link CharSequence} as a model source.
 * 
 * @author Benjamin Bentmann
 */
public class StringModelSource implements ModelSource {

  private String pom;

  private String location;

  /**
   * Creates a new model source backed by the specified string.
   * 
   * @param pom The POM's string representation, may be empty or {@code null}.
   */
  public StringModelSource(CharSequence pom) {
    this(pom, null);
  }

  /**
   * Creates a new model source backed by the specified string.
   * 
   * @param pom The POM's string representation, may be empty or {@code null}.
   * @param location The location to report for this use, may be {@code null}.
   */
  public StringModelSource(CharSequence pom, String location) {
    this.pom = (pom != null) ? pom.toString() : "";
    this.location = (location != null) ? location : "(memory)";
  }

  public InputStream getInputStream() throws IOException {
    return new ByteArrayInputStream(pom.getBytes("UTF-8"));
  }

  public String getLocation() {
    return location;
  }

  /**
   * Gets the character sequence of this model source.
   * 
   * @return The underlying character stream, never {@code null}.
   */
  public String getModel() {
    return pom;
  }

  @Override
  public String toString() {
    return getLocation();
  }

}
